[ycexiao]

What problem does this PR address?

Add a section to showcase diffpy's general refinement feature using agent interface.

What should the reviewer(s) do?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.69%. Comparing base (32ce3e1) to head (4e25b63).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   99.69%   99.69%           
=======================================
  Files           8        8           
  Lines         648      648           
=======================================
  Hits          646      646           
  Misses          2        2           

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